DTC P2759 Torque Converter Clutch Pressure Control Solenoid Control Circuit Electrical (Shift Solenoid Valve SLU): Description

WARNING: This page is about a different car, the 2008 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

The amount of current flow to the solenoid is controlled by the (*) duty ratio of the ECM output signal. The higher the duty ratio becomes, the higher the lock-up hydraulic pressure becomes during the lock-up operation.

Fig 1: Shift Solenoid Valve SLU Pressure Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

(*) Duty Ratio

The duty ratio is the ratio of the period of continuity in one cycle. For example, if A is the period of continuity in one cycle, and B is the period of non-continuity, then Duty Ratio = A/(A+B) x 100(%).

DTC DETECTION CONDITION CHART

DTC No.	DTC Detection Condition	Trouble Area
P2759	Open or short is detected in shift solenoid valve SLU circuit for 1 second or more while driving (1-trip detection logic).	Open or short in shift solenoid valve SLU circuit Shift solenoid valve SLU ECM

Reference (Using an oscilloscope):

Check the waveform between the terminals SLU+ and SLU- of the ECM connector

Fig 2: Identifying Waveform Between Terminals SLU+ And SLU- Of ECM Connector

Standard:

Refer to the illustration above.

WAVEFORM REFERENCE

Terminal	SLU+ - SLU-
Tool setting	5V/DIV., 1 ms./DIV.
Vehicle condition	5th (lock-up) or 6th (lock-up) gear